Weight & Dimensions (8/10) – Average weight and dimension for a full size pen. Very comfortable in the hand.

Nib & Performance (8/10) – I got one of the "Fine 03" nibs. Jet Pens also carries a "Medium 05" nib. It writes very smooth with no visible feathering on the cheap index cards I use.

Filling System (10+/10) - Here's the Magic ! The Preppy is easily converted into an Eyedropper pen, using the entire pen barrel to hold ink. JetPens sells the O-ring gaskets needed for this conversion and they have even posted a How-To article here

Cost & Value (10/10) – Pens are US$ 3 each from either Jet Pens or J-Stationeryand a 10-pack of O-rings costs US$ 3 from JetPens. Refill cartridges are US$ 1.50 for two and they come in LOTS of different colors.

Conclusion (Final score[53]: 8.8) - Some folks on FountainPen Network have grouched a bit about these pens leaking or clogging occasionally, but I believe you are getting a great pen for the money.

And it does not end there !

Platinum Preppy comes as a highlighter and a felt-tip marker (they call them Sign Pens) for US$2.25 each. When you want to change color, they sell replacement tips for both the highlighter and the sign-pen in a two-pack for US$1.50

Noodler's Ink offers package deals of large bottles of ink with eyedroppers. Some (not all) also include an eyedropper converted Preppy pen. JetPens offers eight different eyedropper bottles here, three of which include a free pen. They offer one more here that includes two pens and a white ink here that includes a free sign pen marker. The Noodler's Firefly Yellow ink is the only highlighter ink at JetPens, but Noodler's makes several different colors intended for highlighters.

Syndicate

The D*I*Y Planner product, its name, and its associated designs are owned by Douglas Johnston. Other materials remain the property of their authors and are subject to whatever licenses under which they choose to release them.